Number of permutations of 1..n with all sums of 2 through 5 adjacent terms respectively unique.
A147727
Number of permutations of 1..n with all sums of 2 through 5 adjacent terms respectively unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =16a(4) =54a(5) =232a(6) =936a(7) =3880a(8) =17302a(9) =81584a(10) =409012a(11) =2169742a(12) =11998726a(13) =69653068a(14) =426511054a(15) =2718410098a(16) =18114464012
External references
- oeis: A147727